I remember a long time ago that I read an old story when the CMC confess that they are Anon-A-Miss, Applejack, Rarity, and Rainbow Dash said that they forgive them and they are family and family forgive each other, but Twilight hear everything they just said and was not happy with that. They forgive their sisters but not Sunset. And then don't want anything to do with Flash when he said he thought Sunset was going back to her old ways.

Can anyone please send me a link to that story? Because I can't seem to find it.

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I think I recall reading a fic with such description, but I can't remember the title.

Can You Say...Forgiveness?

I found another, it's a one-shot, and it's suicidal, so if it bothers you, I recommend not reading it.

But the other story did have the 'CMC forgiven, not not Sunset' thing, it's called The Setting Sun. https://www.fimfiction.net/story/310191/the-setting-sun